Key to the Grave

From the title page:

A poor innkeep has a ghastly problem on his hands. A strange man staying at the inn was found dead in his room, but when the guard arrived to claim the body, it was missing. More troubling though is his possessions and the holy symbol of an evil god found under his bed. Part Two of the “Key to Greyhawk” series, the first part of which is the Mad God’s Key found in Dungeon Magazine #114. Playing part one is recommended but not required. An adventure for PCs level 1-6 (APLs 2-6).